Adding Fractions Practice
Practise adding fractions — starting with matching denominators, then the trickier unlike ones. Type your answer as a fraction.
Practice now
How to add fractions
Fractions can only be added when their denominators match — you can’t add quarters and thirds until they’re the same kind of piece. Once the bottoms match, you simply add the tops.
- If the denominators are the same, add the numerators and keep the denominator.
- If they’re different, rewrite the fractions with a common denominator first.
- Add the numerators, then simplify the result if you can.
Type your answer with the fraction-bar key, like 3/4.
Worked examples
Tips & common mistakes
The golden rule: never add the denominators — 1/4 + 1/4 is 2/4, not 2/8. When denominators differ, the smallest common denominator keeps the numbers easy. On the harder levels, give your answer in lowest terms.
- Adding the bottoms as well as the tops — the denominator stays the same once the pieces match.
- Adding unlike fractions without finding a common denominator first.
- Forgetting to simplify the final answer when asked.
Frequently asked questions
How do you add fractions with the same denominator?
Add the numerators and keep the denominator the same. 2/7 + 3/7 = 5/7.
How do you add fractions with different denominators?
Rewrite them with a common denominator first, then add the numerators. 1/3 + 1/6 becomes 2/6 + 1/6 = 3/6 = 1/2.
Why don’t we add the denominators?
The denominator names the size of the pieces. Adding two quarters gives more quarters, not smaller pieces, so the bottom stays 4.
How do I type my answer?
Type the numerator, tap the fraction-bar key, then the denominator — for example 3 / 4.
What grade is adding fractions?
Adding fractions with like denominators is a grade 4 skill; unlike denominators come in grades 4–5.